There are approximately 571,000 underground storage tanks (USTs) nationwide that store petroleum or hazardous substances. The greatest potential threat from a leaking UST is contamination of groundwater, the source of drinking water for nearly half of all Americans. EPA, states, and tribes work together to protect the environment and human health from potential UST releases. You can learn more about USTs on our Basic Information page.

Cleaning Up UST Releases
Regulations require that leaking USTs be cleaned up to restore and protect groundwater sources. This section includes information and resources to help UST owners and operators meet those requirements.

BiofuelsThis section provides information about biofuels, such as ethanol and biodiesel.